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Discontinued operations - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 07, 2019 | Aug. 31, 2019 | Feb. 14, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Discontinued operations |  |  |  |  |  |  |
Proceeds From Repatriated Funds | $ 1,100,000 |  |  | $ 1,000,000 | $ 2,750,000 | $ 458,000 | $ 400,000
Disposal Group, Including Discontinued Operation, Consideration |  |  | $ 7,000,000 |  |  |  |
Proceeds from Divestiture of Businesses |  | $ 265,000 | 6,735,000 |  |  |  |
Supplemental Deferred Purchase Price |  |  | $ 265,000 |  |  |  |

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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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